調適性遠時程瑞雷衰退通道預測演算法及應用於調適性調變

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蔡欣學(Hsin-Shieh Tsai) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

調適性遠時程瑞雷衰退通道預測演算法及應用於調適性調變
(Effects of adaptive prediction algorithms on adaptive QAM in flat Rayleigh fading channels)

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摘要(中)

本論文旨在探討如何真正地實現調適性遠時程通道預測演算法(Adaptive Long Range Prediction，簡稱Adaptive LRP)，並且將此結果應用在調適性調變系統上。本論文將針對在多重路徑衰退通道之中，使用遞迴最小平方演算法(RLS)、傳統的固定步階參數最小均方演算法(LMS)與可變步階參數最小均方演算法(VSLMS)等調適性濾波技術，並且考慮通道特性等因素，做調適性調變系統的調適性遠時程瑞雷衰退通道預測演算法設計及其評估，以及比較它們位元錯誤率和BPS性能，並考慮運算複雜度，以評估其實現之可能性。再者，根據不同的都卜勒頻率偏移決定適合的遠時程通道預測演算法階數及調適性調變系統的臨界值。

摘要(英)

The aim of this thesis is to propose three kinds of adaptive long rang prediction (Adaptive LRP) algorithms and extend the prediction result to the adaptive modulation. The adaptive LRP algorithms we used here are recursive least-square (RLS) algorithm, traditional least-mean-square (LMS) algorithm using a fixed step-size parameter and variable step-size least-mean-square (VSLMS) algorithm. We will investigate the BER and BPS performance of adaptive modulation in Rayleigh fading channel by using our proposed adaptive LRP algorithms and perfect prediction. Furthermore, we will also consider different speed zone to decide the suitable order of the adaptive LRP algorithms and the threshold of the adaptive modulation system.

關鍵字(中)

★ 遞迴式最小平方演算法
★ 最小均方演算法
★ 可變步階參數最小均方演算法
★ 調適性遠時程通道預測演算法
★ 調適性調變
★ 調適性傳輸

關鍵字(英)

★ variable step-size LMS
★ adaptive transmission
★ adaptive modulation
★ adaptive long range prediction algorithm
★ RLS
★ LMS

論文目次

1.1 研究動機……………………………………………….1
1.2 論文章節介紹………………………………………….3
第二章系統模型及基本架構
2.1 多重路徑衰退通道……………………………………..6
2.2 調適性調變系統………………………………………..9
2.3 導引符元輔助調變(PSAM)系統模型…………………13
第三章方法及原理介紹
3.1 遞迴式最小平方演算法 (RLS)……………………….17
3.2 最小均方演算法 (LMS)………………………………19
3.3 可變步階參數最小均方演算法 (VSLMS)……….…..22
3.4 修正型反覆自動回歸方程式 ………………………….28
3.5 如何決定臨界值……………………………………….30
3.6 行動載具測速機制…………………………………….34
第四章模擬結果比較與分析
4.1 模擬參數介紹………………………………………….37
4.2 預測通道訊雜比的方式……………………………….39
4.3 瞬間位元錯誤率限制與平均位元錯誤率限制之臨界值於調適性調變系統比較……………………………….42
4.4 固定階數之遠時程衰退通道預測演算法於固定臨界值之調適性調變系統性能比較………………………….44
4.5 最佳臨界值之選擇…………………………………….47
4.6 最佳階數之選擇……………………………………….51
4.7 最佳選擇階數之遠時程衰退通道預測演算法於最佳選擇臨界值之調適性調變系統性能比較……………….61
4.8 記憶展延……………………………………………….65
4.9 接收器架構之設計…………………………………….68
第五章結論
參考文獻

參考文獻

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指導教授

陳永芳(Yung-Fang Chen)

審核日期

2003-6-24

推文